<h2>Problem 60</h2>
<div style="color:#666;font-size:80%;">02 January 2004</div><br />
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<p>The primes 3, 7, 109, and 673, are quite remarkable. By taking any two primes and concatenating them in any order the result will always be prime. For example, taking 7 and 109, both 7109 and 1097 are prime. The sum of these four primes, 792, represents the lowest sum for a set of four primes with this property.</p>
<p>Find the lowest sum for a set of five primes for which any two primes concatenate to produce another prime.</p>

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